Method of managing a calendar and a computer system for implementing that method

ABSTRACT

Methods, systems and machine readable media for operating a calendar in a data processing system. In one exemplary method of managing a calendar, which contains at least one event, said method comprises:  
     making available the calendar in an electronic format;  
     subscribing to said calendar;  
     downloading said calendar from a host electronic device to a subscriber electronic device; and  
     storing said calendar in said electronic format to form a local calendar.

[0001] This application is related to and hereby claims the benefit of the filing date of U.S. Provisional Patent Application Serial No. 60/406,521 filed Sep. 9, 2002, which application is hereby incorporated herein by reference.

[0002] The present invention relates to a method of managing a calendar and a computer system for implementing that method.

[0003] In the last fifty years, the pace of life and complexity for the consumer has increased considerably. Hitherto, many consumers merely required a simple manuscript diary or calendar to organise the various commitments and events occurring in their life. In due course, the complexity of life has necessitated improved organisation of the multitude of events occurring across many different areas of a consumers life. This has resulted in many instances of electronic devices being used with electronic calendar facilities provided.

[0004] A consumers life is typically demarcated by events occurring at work, those at home and those socially. Being advised of the various events and managing a calendar to organise those events is very difficult. To date, new events are often advised by manuscript publications or over the Internet. However, such new events need to be entered on the consumers chosen electronic calendar or each electronic calendar. Entering of those events is very time consuming, leads to errors and can easily overwhelm the ease of using the electronic calendar.

SUMMARY OF THE DESCRIPTION

[0005] Certain embodiments of the present invention relate to a method of managing a calendar, said calendar containing at least one event, said method comprising:

[0006] making available the calendar in an electronic format;

[0007] subscribing to said calendar;

[0008] downloading said calendar from a host electronic device to a subscriber electronic device; and

[0009] storing said calendar in said electronic format to form a local calendar.

[0010] Also the present invention provides a computer system having a host electronic device and at least one subscriber device and a computer program arranged for implementing such a method.

[0011] The foregoing method is facilitated, in one exemplary embodiment, through the use of a computer program operative on a computer such as one of the Macintosh personal computers from the applicant, Apple Computer Inc. of Cupertino, Calif., USA. More preferably the computer program is operative in the MacOS x version 10.2, known as Jaguar (Registered Trade Mark). Moreover, the computer program is complementary to Mail and Address Book computer applications also available from Apple for full personal information management. The computer program of this particular embodiment is compatible with printing applications and functions.

[0012] In addition, the computer program of this particular embodiment is compliant with standards for calendaring applications such as iCal and vCal (both Registered Trade Marks) and allows import of data from other applications like Entourage (Registered Trade Mark) available from Microsoft. Further details can be obtained from http://www.imc.org/draft-ietf-calsch-inetcal-guide. The computer program of this particular embodiment is also compatible with the iTools web service available from Apple in order to share calendar data easily over the Internet.

[0013] In view of the compatibility discussed above and in particular with the operating system, the computer program of this particular embodiment enables copy and paste with other applications, drag and drop facilities, use of the spellchecker, integration with email applications and integration with address applications for management of personal information.

[0014] Thus, the present invention provides, in certain embodiments, a method for enabling a user to publish his or her calendar to other users and the user can subscribe to other calendars thereby coordinating or managing events of one user with those of another.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Embodiments of the present invention will now be described by way of further example only and with reference to the accompanying drawings, in which:

[0016]FIG. 1 is a schematic illustration of one embodiment of the present invention;

[0017]FIG. 2 is a schematic diagram of a flow chart for changing an event of a published calendar according to the present invention;

[0018]FIG. 3 is a diagram of a user interface according to the present invention;

[0019]FIG. 4 is a diagram of the user interface according to the present invention illustrating two situations, one displaying events from two calendars and the other displaying events from only one calendar;

[0020]FIG. 5 is a diagram of a user interface according to the present invention illustrating a different data range as the primary date range;

[0021]FIG. 6 is a diagram of a user interface according to the present invention illustrating the display of events;

[0022]FIG. 7 is a diagram of a user interface according to the present invention illustrating to do items;

[0023]FIG. 8 is a diagram of a user interface according to the present invention illustrating a search result window;

[0024]FIG. 9 is a diagram of a user interface according to the present invention illustrating overlapping events;

[0025]FIG. 10 is a diagram of part of a user interface according to the present invention illustrating said overlapping events in more detail; and

[0026]FIG. 11 is a diagram of a publish interface for publishing one of the calendars.

DETAILED DESCRIPTION

[0027] Embodiments of the present invention relate to calendar operations on a data processing system. A data processing system which may be used with embodiments of the invention typically include a display for displaying a calendar interface and a processor for controlling the display and an input device. Examples of such data processing systems include general purpose computers or special purpose computers or personal digital assistants or cellular telephones. Examples of data processing systems are shown and described in U.S. Pat. No. 6,222,549 which is hereby incorporated herein by reference. Often, the data processing system will include a memory for storing software (e.g. computer program) instructions. Embodiments of the invention may be embodied, at least in part, in software. That is, the techniques may be carried out in a computer system or other data processing system in response to its processor, such as a microprocessor, executing sequences of instructions contained in a memory, such as ROM, volatile RAM, non-volatile memory, cache or a remote storage device (addressable through a network). In various embodiments, hardwired circuitry may be used in combination with software instructions to implement the present invention. Thus, the techniques are not limited to any specific combination of hardware circuitry and software nor to any particular source for the instructions executed by the data processing system. In addition, throughout this description, various functions and operations are described as being performed by or caused by software code to simplify description. However, those skilled in the art will recognize what is meant by such expressions is that the functions result from execution of the code by a processor, such as the microprocessor of a data processing system.

[0028] A machine readable media can be used to store software and data which when executed by a data processing system causes the system to perform various methods of the present invention. This executable software and data may be stored in various places including for example ROM, volatile RAM, non-volatile memory and/or cache. Portions of this software and/or data may be stored in any one of these storage devices.

[0029] Thus, a machine readable media includes any mechanism that provides (i.e., stores and/or transmits) information in a form accessible by a machine (e.g. a computer, network device, personal digital assistant, manufacturing tool, any device with a set of one or more processors, etc.). For example, a machine readable media includes recordable/non-recordable media (e.g. read only memory (ROM); random access memory (RAM); magnetic disk storage media; optical storage media; flash memory devices; etc.) as well as electrical, optical, acoustical or other forms of propagated signals (e.g. carrier waves, infrared signals, digital signals, etc.); etc.

[0030]FIG. 1 relates to a first embodiment of the present invention. There is illustrated schematically a computer server 2 on which is stored a calendar 4 containing at least one event. A number of subscriber electronic devices 6 a, 6 b etc are each connected to the server 2. In the preferred embodiment, the computer server is provided over the Internet and the subscribers are computers connected intermittently to the server. Alternatively, the server could comprise a local area network to which the subscribers are connected permanently. The electronic devices could comprise any form of electronic device such as a notebook or laptop computer, personal digital assistant, mobile telephone, palm device etc.

[0031] The server 2 has stored thereon the calendar of events 4. The calendar 4 is downloaded and stored on each of the subscribers to form a local calendar 8 a, 8 b etc. The local calendar is stored in the same electronic format as on the server. The preferred embodiment enables the local calendar to be stored with a subscriber calendar 10 a, 10 b etc. In particular, the local calendar and the subscriber calendar both share the same user interface as described subsequently.

[0032] The present invention may also include a viewer electronic device 12. A viewer 12 may access the calendar stored on the server but may not download the same to form a local calendar. In order for a viewer to become a subscriber, the viewer may have to pay a subscriber fee.

[0033] A viewer electronic device may comprise any of the same subscriber electronic devices, for example a notebook or laptop computer, personal digital assistant, mobile telephone, palm device etc and be connected in any of the arrangements as discussed for a subscriber. Depending upon the electronic device involved any suitable electronic connection may be made as is well known in the art including USB, serial ports, firewire, bluetooth, infrared and over the Internet.

[0034] The preferred embodiment also enables a subscriber 6 b to publish their local calendar 10 b to the server 2 or for viewing by a viewer 12. Another subscriber, such as 6 a may download the published local calendar 10 b to form a local subscriber calendar 10 a/b. The viewer may view the local calendar stored on the server 10 b or directly if connected to the subscriber.

[0035] The subscribers may also be connected directly. In this case, a subscriber 6 a may publish the local calendar 10 a to the other subscriber 6 b which is then stored to form a local subscriber calendar 10 b/a stored on subscriber 6 b.

[0036] The present invention provides for any number of calendars to be provided by the server or any number of electronic devices either subscriber or viewer to be included.

[0037] Many calendars are not static. Static calendars include those relating to national holidays, birthdays, daylight saving transition dates, tide data etc. However, many calendars are not static and events need to be added, modified or deleted. All of these are termed as changes. FIG. 2 illustrates schematically changes to be effected on a calendar which is published.

[0038] In the first instance a change may be made to a calendar in operation 20. If the change occurs on a calendar 4 stored on the server 2, then each subscriber 6 a, 6 b, downloads the change in operation 22 and the local calendar 8 a, 8 b is updated in operation 24. If the change occurs on a local calendar 10 a stored on a subscriber, then the calendar, if sent directly to another subscriber 6 b, is downloaded by the subscriber 6 b and the local subscriber calendar 10 b/a is updated. If the local calendar 10 b is published on the server 2, then the local calendar 10 b is republished in operation 26. The other subscriber 10 a, downloads the republished calendar 10 b and updates the local subscriber calendar 10 a/b stored thereon.

[0039] The preferred embodiment also provides for a dialog between users operating the subscriber devices in order to confirm, disagree or amend any changes. A user of one of the subscribers may send a notification to the other subscriber in operation 28. The recipient subscriber may reply to confirm the change in operation 30. The change is then effected on the calendar and the change implemented on the local calendar as discussed above. The recipient subscriber may reply to disagree or amend the proposed change in operation 32. The subscriber and recipient may conduct this dialog between notifying 28 and replying 32 until a reply to confirm 30 is received. The change is then effected as discussed above.

[0040] The server or subscriber generating the calendar 4, 10 a or 10 b may provide for the recipient subscriber to view the calendar only or effect changes. Other preferences may be determined by the server or subscriber. Such preferences include the time period between making changes to the calendar and downloading those changes. Other preferences include merely notifying a user of a subscriber of a change. All such preferences are facilitated through the use of a user interface.

[0041] The present invention thus enables events from more than one calendar to be disseminated and organised in a method which is more manageable. In particular, events do not need to be re-entered onto the users electronic calendar thereby avoiding errors and the user can selectively choose events from certain calendars to be included in their local calendar. Moreover, the method provides for changes being effected and a dialog between at least two users for confirming on changes to be made.

[0042] The present invention of managing a calendar is particularly suited for implementation by a computer program comprising a plurality of calendars as described in our other co-pending U.S. patent application filed contemporaneously by the same inventors and entitled “A Computer Program Comprising A Plurality Of Calendars,” attorney docket no. 04860.P2996. For the sake of completeness, a description of this computer program is provided hereafter even though this other application is incorporated herein by reference.

[0043] The present invention includes a computer program having a user interface providing an interface for two or more calendars and the events from the two or more calendars may be selectively displayed simultaneously in a single calendar interface. FIG. 3 is a diagram of such a user interface 200. The user interface includes a number of windows 400, 600 and 800. Window 400 is titled “My Calendars”. FIG. 3 illustrates the use of the user interface with two calendars, namely “Home” and “Work”. The names of the calendars are displayed in the “My Calendars” window. Preferably, the calendars “Home” and “Work” are created by default. Other calendars may be included, especially public event calendars.

[0044] Window 600 comprises a primary date range. In FIGS. 3 and 4, the primary date range comprises a day with a data field for each hour. In FIG. 3, the primary date range is a month. Needless to say, the primary date range may be weekly or daily or another period of time. A selector 1000 in the user interface enables a user to select which primary date range to display.

[0045] The primary date range includes a data field for each unit of the primary date range. That is to say, in the daily date range, the data fields are hours, in the weekly date range, the data fields are days or hours, in the monthly date range, the data fields are days or hours and in the yearly date range, the data fields are months, weeks, days or hours. As shown in FIG. 3, the data fields may display sub-fields for each hour of the day when the primary date range is monthly. Similarly, in the yearly date range, each data field may display sub-fields for each day. In the daily date range, the preferred embodiment of the computer program displays only some of the hours available.

[0046] Window 800 enables a subsidiary date range to be displayed. In FIGS. 3 and 4, the subsidiary date range is monthly. A marker 1200, enables the day selected in the primary date range to be indicated in the subsidiary date range. For example, Tuesday Feb. 5, 2002 is shown in the primary date range and this day is indicated by the marker in the subsidiary date range which displays February 2002.

[0047] The user interface provides a toggle or control interface 1400 for each calendar. The user interface indicates to the user that the toggle is activated when a tick or check mark appears next to the name of the calendar. If a toggle is activated, then the events from the respective calendar are displayed by the user interface, typically by displaying the events in a calendar interface such as a daily or weekly or monthly view. FIG. 4 illustrates two situations for the user interface. One situation has the user interface displaying events from two calendars, namely “Home” and “Work” whereas the other situation has the user interface displaying events from only one calendar, namely “Home”. For example, in the first situation in FIG. 4, there is an event occurring at 10 am, namely “Meeting” which is not displayed in the other situation since this event only appears in the calendar “Work” which is not activated.

[0048] The present invention thus enables a user to manage all of the required calendars using a computer program having a single user interface and all of the two or more calendars may be calendars for the same user displaying events, meetings, etc. for that user. The user interface significantly enhances the management of the events occurring over a plurality of calendars. Thus, when checking availability of a new event, a user merely needs to activate all of the relevant calendars (leaving the other calendars not activated), and the events in all the relevant (activated) calendars are all displayed and a user can easily confirm whether there is availability. Conversely, when considering just one category of events, a user merely needs to deactivate the redundant calendars and activate only the one relating to the particular category. The user interface thus very efficiently manages the calendars on the one hand by combining all of the calendars and yet allows flexibility to focus on one or a few calendars to minimise confusion and reduce complexity.

[0049] FIGS. 6 to 9 illustrate an embodiment of the present invention. In FIGS. 6 to 9, window 800 displays more than one month as the subsidiary date range. Moreover, the marker 1200, indicates a selected week. Window 600 comprises the primary date range of a week with hourly data fields for each day of the week. The user interface indicates a particular day in the primary date range and a detailed marker 1600 in the subsidiary date range indicates the same day. For example, Tuesday Aug. 27, 2002 is highlighted in the primary date range and the detailed marker indicates the same day and this is distinguished from the marker 1200 in the subsidiary date range.

[0050]FIG. 6 illustrates an event, namely “My Event”. The event is displayed as a 2-D shape, namely a rounded rectangle. The 2-D shape has boundaries which are approximately contiguous with the specified duration, namely 9 am to 1 p.m.

[0051] In order to minimise confusion, only one of the calendars is selected for editing at any one time. Thus, a user selects a calendar of most importance in the hierarchy of all of the calendars. This is indicated by highlighting in the user interface. For example, as shown in FIG. 6, the calendar “lala” is highlighted, thereby indicating that as the most important calendar.

[0052] When a user wishes to add, select, modify or delete an event, the user may highlight the event and double click. An interrogator interface 2000 is activated and displayed. The date of the event and duration are displayed as shown at 2200. Changes can be made using the arrows. The calendar from which the event is taken is also displayed at 2400. The event may be moved from one calendar to another by changing the associated calendar appearing at 2400. The details of the event are displayed at 2600. Not only may the event be changed but also properties associated with the event may be changed. For example, an alarm may be indicated and/or selected at 2800. When the alarm is due, any known computer program alarm may be provided such as an audio or visual announcement. A shortcut 3000 may be activated to set the duration as the whole day or other duration depending upon the primary date range used. Another property is to set the event as recurring. A recurring event may comprise for example Birthdays, anniversaries, regular appointments etc.

[0053] The user interface shown in FIG. 6 also includes an additional window 4000. Window 4000 is entitled “To Do items”. To do items include those tasks for which a specific time is not required but set for a particular day, week, month or year, depending upon the primary date range selected. In FIG. 6, the primary date range is weekly and the to do items are noted for a particular day. To do items can be displayed such as that shown in FIG. 7. The to do items may be implemented in a “Franklin Covey mode”.

[0054]FIG. 8 illustrates a user interface with an additional window 5000. Window 5000 provides another subsidiary date range, in this case weekly. The events occurring in window 5000 are generally of a day long duration. Such a display is particularly useful when displaying user's holidays or national holidays or other events of a day duration such as Birthdays. Those events are indicated by a 2-D rectangular shape with rounded corners at the extremities of the duration. Such events are termed banners. A banner may also be used to display a weekend or holiday period. The computer program is able to display such a banner with rectangular corners at the extremity of the duration when the shortcut 3000 is activated.

[0055] The computer program of the present invention also provides for searches to be effected. The searches are facilitated by search interface 6000. A string of characters is entered into the search interface. A search is conducted across selected calendars and the search results are displayed in a search result window 6200. For example in FIG. 8, the search string “acan” was entered and various entries identified and displayed. The search interface also enables each of the events presented thereby to be viewed and/or changed and selecting one of the results in the search interface for changing may produce the interrogator interface as discussed above.

[0056] As discussed above, events from each toggled calendar are displayed by the user interface. FIG. 9 illustrates the user interface whereby several calendars are toggled, namely “US Holidays 2”, “lala”, “Jewish Holidays”, “testpub” and “VacancesG5”. The events are shown in the primary date range. It is not uncommon for events to conflict. Thus, a distinguishing feature is provided to distinguish between conflicting events. The distinguishing feature may comprise a different colour, the shape of the event being displayed differently and/or one of the events being translucently displayed. When colour is used, the name of the calendar and each of the events or their shape take the same colour.

[0057] In FIG. 9, there are two conflicting events which overlap between 11.30 am and 1 p.m. The events are displayed in a translucent manner and with their shape reduced such that the lateral boundary does not extend the full width of the day data field. FIG. 10 illustrates this in more detail. In this case, there are two conflicting events with the event entitled “New event” at 10.30 am. The other events “New event” at 9.15 am and “envoyer list bug” are reduced in size and aligned with the left perimeter of the day data field whereas the event “New event” at 10.30 am is reduced in size and aligned with the right perimeter of the day data field. Moreover, event “New event” at 1030 am is made translucent so that event “New event” at 9.15 am can be seen there through and event “envoyer list bug” is overlaid.

[0058] Finally, FIG. 11 illustrates a publish interface for facilitating the publication of the selected calendar. In the publish interface, one of the calendars is selected at 9000. A user may set preferences associated with the selected published calendar. For example, all changes effected on the calendar are published automatically at 9200. All notes and events are included at 9400. Any alarms set can also be included or not in the published calendar at 9500 since these may not be relevant to a subscriber. Similarly any to do items can be included or not in the published calendar at 9600. Finally, the publish interface enables the calendar to be published either over the Internet or on a server at 9700. Confirmation or cancellation can be effected via buttons 9800. Finally, a status of the publication is indicated at 9900.

[0059] Two features of embodiments of the present invention are the instant access to data and the natural selection and visualisation of other sources of events. The present invention may contain a large multitude of events, in particular because of its ability to include many calendars within a calendar interface for a user. Thus, it becomes critical for a user to quickly and easily find relevant data in a given context. For example, during work hours, a user must be able to easily find meetings concerning a given project, by selecting only the work calendar and searching for the given project. However, at home, the same user, with the same computer program and user interface must have a way to easily find social details such as the soccer matches for any given team, again through selecting only the relevant calendars and searching for the given team. The user is thus provided with a live textual search system and related navigational facilities.

[0060] Embodiments of the present invention thus achieve the objectives of enabling a user to manage all of the required calendars using a computer program having a single user interface. The user interface significantly enhances the management of the events occurring over a plurality of calendars. Thus, when checking availability of a new event, a user merely needs to activate (e.g. “toggle”) all of the relevant calendars, whose events are all displayed and a user can easily confirm whether there is availability. Conversely, when considering just one category of events, a user merely needs to deactivate (e.g. “de-toggle”) the redundant calendars and activate only the one relating to the particular category. The user interface thus very efficiently manages the calendars on the one hand by combining all of the calendars and yet allows flexibility to focus on one or a few calendars to minimise confusion and reduce complexity.

[0061] To enhance the security of data integrity and reduce complexity, it is preferred that data involved in the computer program is always synchronised across various electronic devices. A method of synchronising three or more electronic devices is described in one of our other co-pending applications filed on the same day by the same inventors and entitled “A Method Of Synchronizing Three Or More Electronic Devices And A Computer System For Implementing That Method,” attorney docket no. 04860.P2998, which application is hereby incorporated herein by reference.

[0062] The foregoing description has been given by way of example only and it will be appreciated by a person skilled in the art that modifications can be made without departing from the scope of the present invention. 

1. A method of managing a calendar, said calendar containing at least one event, said method comprising: making available the calendar in an electronic format; subscribing to said calendar; downloading said calendar from a host electronic device to a subscriber electronic device; and storing said calendar in said electronic format to form a local calendar.
 2. A method as claimed in claim 1, in which said making available said calendar comprises publishing said calendar over the Internet.
 3. A method as claimed in claim 1, further comprising: making changes to the events in said calendar; downloading said changes from the host electronic device to said subscriber device; and updating the local calendar stored on said subscriber electronic device with said changes.
 4. A method as claimed in claim 3, further comprising: notifying a user of the subscriber electronic device of said changes.
 5. A method as claimed in claim 1, further comprising: notifying a user of one of the devices of a new event or change to one of the events; replying to said notification to confirm said new event or change; making said change to either said calendar or said local calendar; downloading said change from the updated device to the other device; and updating the other calendar stored on the other device.
 6. A method as claimed in claim 5, after said step of notifying a user, further comprising: replying to said notification to disagree or amend said new event or change; and re-notifying said user to confirm or amend said notification.
 7. A method as claimed in claim 3, in which there are a plurality of subscriber electronic devices.
 8. A method as claimed in claim 3, in which said subscriber electronic device includes at least one subscriber calendar and said local calendar is stored with said subscriber calendar.
 9. A method as claimed in claim 8, in which said subscriber calendar and said local calendar share a user interface.
 10. A computer system having a host electronic device and at least one subscriber device and a computer program arranged for implementing a method as claimed in claim
 1. 11. A computer system as claimed in claim 10, in which the or each subscriber electronic device includes at least one subscriber calendar and said local calendar is stored with said subscriber calendar.
 12. A computer system as claimed in claim 11, in which the or each said subscriber calendar and said local calendar share a user interface.
 13. A computer system as claimed in claim 12, in which said user interface comprises more than one window.
 14. A computer system as claimed in claim 13, in which one of said windows comprises a primary data range.
 15. A computer system as claimed in claim 14, in which said primary date range contains a data field for each day of a month.
 16. A computer system as claimed in claim 14, in which said primary date range contains a data field for each day of a week.
 17. A computer system as claimed in claim 14, in which said primary data range contains a data field for each month of a year.
 18. A computer system as claimed in claim 14, in which said primary date range contains a data field for each of a plurality of hours of a selected day.
 19. A computer system as claimed in claim 18, in which another of said windows comprises a subsidiary date range comprising at least one month and including a marker for indicating the selected day.
 20. A computer system as claimed in claim 18, in which another of said windows comprises a second subsidiary date range comprising at least one week and including a secondary marker for indicating the selected day.
 21. A computer system as claimed in claim 10, in which one of said calendars is selected as a most important calendar.
 22. A computer system as claimed in claim 21, further comprising an interrogator interface for adding, selecting, modifying and deleting an event in said most important calendar.
 23. A computer system as claimed in claim 22, in which said interrogator interface also enables an event to be moved from one calendar to another.
 24. A computer system as claimed in claim 22, in which said interrogator interface also enables a property to be assigned to an event or modified.
 25. A computer system as claimed in claim 24, in which said property comprises the event appearing recurrently.
 26. A computer system as claimed in claim 24, in which said property comprises an alarm.
 27. A computer system as claimed in claim 10, further comprising a toggle for each calendar, for enabling events of a toggled calendar to be displayed by the user interface.
 28. A computer system as claimed in claim 10, in which said events are displayed as a 2-D shape at least approximately extending the duration specified.
 29. A computer system as claimed in claim 28, in which events which overlap are distinguished from each other by a distinguishing feature.
 30. A computer system as claimed in claim 29, in which said distinguishing feature comprises a different colour.
 31. A computer system as claimed in claim 29, in which said distinguishing feature comprises a different 2-D shape only partially extending the specified duration.
 32. A computer system as claimed in claim 29, in which said distinguishing feature comprises one event being translucent such that the other overlapping event can be displayed therebehind.
 33. A computer system as claimed in claim 10, further comprising a search interface for enabling a search across one or more calendars.
 34. A computer system as claimed in claim 21, further comprising a task interface for enabling tasks to be entered on said most important calendar.
 35. A machine readable medium containing executable computer program instructions which when executed cause a data processing system to perform a method of managing a calendar, said calendar containing at least one event, said method comprising: making available the calendar in an electronic format; subscribing to said calendar; downloading said calendar from a host electronic device to a subscriber electronic device; and storing said calendar in said electronic format to form a local calendar.
 36. A machine readable medium as claimed in claim 35, in which said making available said calendar comprises publishing said calendar over the Internet.
 37. A machine readable medium as claimed in claim 35, further comprising: making changes to the events in said calendar; downloading said changes from the host electronic device to said subscriber device; and updating the local calendar stored on said subscriber electronic device with said changes.
 38. A machine readable medium as claimed in claim 37, further comprising: notifying a user of the subscriber electronic device of said changes.
 39. A machine readable medium as claimed in claim 35, said method further comprising: notifying a user of one of the devices of a new event or change to one of the events; replying to said notification to confirm said new event or change; making said change to either said calendar or said local calendar; downloading said change from the updated device to the other device; and updating the other calendar stored on the other device.
 40. A machine readable medium as claimed in claim 39, after said notifying a user, said method further comprising: replying to said notification to disagree or amend said new event or change; and re-notifying said user to confirm or amend said notification.
 41. A machine readable medium as claimed in claim 37, in which there are a plurality of subscriber electronic devices.
 42. A machine readable medium as claimed in claim 37, in which said subscriber electronic device includes at least one subscriber calendar and said local calendar is stored with said subscriber calendar.
 43. A machine readable medium as claimed in claim 42, in which said subscriber calendar and said local calendar share a user interface.
 44. A data processing apparatus for processing a calendar containing at least one event, said data processing apparatus comprising: means for making available the calendar in an electronic format; means for subscribing to said calendar; means for downloading said calendar from a host electronic device to a subscriber electronic device; and means for storing said calendar in said electronic format to form a local calendar.
 45. A data processing apparatus as claimed in claim 44, in which said means for making available said calendar comprises means for publishing said calendar over the Internet.
 46. A data processing apparatus as claimed in claim 44, further comprising: means for making changes to the events in said calendar; means for downloading said changes from the host electronic device to said subscriber device; and means for updating the local calendar stored on said subscriber electronic device with said changes.
 47. A data processing apparatus as claimed in claim 46, further comprising: means for notifying a user of the subscriber electronic device of said changes.
 48. A data processing apparatus as claimed in claim 44, further comprising: means for notifying a user of one of the devices of a new event or change to one of the events; means for replying to said notification to confirm said new event or change; means for making said change to either said calendar or said local calendar; means for downloading said change from the updated device to the other device; and means for updating the other calendar stored on the other device.
 49. A data processing apparatus as claimed in claim 48, after said notifying a user, further comprising: means for replying to said notification to disagree or amend said new event or change; and means for re-notifying said user to confirm or amend said notification.
 50. A data processing apparatus as claimed in claim 46, in which there are a plurality of subscriber electronic devices.
 51. A data processing apparatus as claimed in claim 46, in which said subscriber electronic device includes at least one subscriber calendar and said local calendar is stored with said subscriber calendar.
 52. A data processing apparatus as claimed in claim 51, in which said subscriber calendar and said local calendar share a user interface. 